Redis数据库（六）——jedis操作和整合springboot
Jedis项目搭建
Jedis是Redis官方推荐的Java连接开发工具。要在Java开发中使用好Redis中间件，必须对Jedis熟悉才能
写成漂亮的代码
1、导入相关依赖
<dependencies>
<!--导入jedis包-->
<dependency>
<groupId>redis.clients</groupId>
<artifactId>jedis</artifactId>
<version>3.6.0</version>
</dependency>
<!--导入fastjson-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.70</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>1.7.25</version>
</dependency>
</dependencies>
2、application.properties配置redis配置
# 应用名称
spring.application.name=redis_springboot
#Redis服务器地址
spring.redis.host=192.168.137.4
#Redis服务器连接端口
spring.redis.port=6379
#Redis数据库索引（默认为0）
spring.redis.database= 0
#连接超时时间（毫秒）
spring.redis.timeout=1800000
#连接池最大连接数（使用负值表示没有限制）
spring.redis.lettuce.pool.max-active=20
#最大阻塞等待时间(负数表示没限制)
spring.redis.lettuce.pool.max-wait=-1
#连接池中的最大空闲连接
spring.redis.lettuce.pool.max-idle=5
#连接池中的最小空闲连接
spring.redis.lettuce.pool.min-idle=0
3、编写测试类测试是否ping成功
注意：必须要在配置文件取消本地和安全模式
package com.study;
import redis.clients.jedis.Jedis;
public class TestPing {
public static void main(String[] args) {
//1.new Jedis对象
Jedis jedis = new Jedis("192.168.137.4",6379);
System.out.println(jedis.ping());
}
}
Jedis常用API
一、key操作
package com.study;
import redis.clients.jedis.Jedis;
public class TestKey {
public static void main(String[] args) {
Jedis jedis = new Jedis("192.168.137.4",6379);
System.out.println("清空数据："+jedis.flushDB());
System.out.println("判断某个键是否存在："+jedis.exists("username"));
System.out.println("新增<username,zhangsan>的键值对："+jedis.set("username","zhangsan"));
System.out.println("新增<password,password>的键值对："+jedis.set("password","password"));
System.out.println("查看所有的key："+jedis.keys("*"));
System.out.println("删除key键password："+jedis.del("password"));
System.out.println("判断key键password是否存在："+jedis.exists("password"));
System.out.println("查看username所存储的值的类型："+jedis.type("username"));
System.out.println("随机返回key空间的一个："+jedis.randomKey());
System.out.println("重命名key："+jedis.rename("username","name"));
System.out.println("取出改后的name："+jedis.get("name"));
System.out.println("按索引切换数据库："+jedis.select(0));
System.out.println("清空数据库："+jedis.flushDB());
System.out.println("返回当前数据库中key的数目："+jedis.dbSize());
System.out.println("清空所有数据库："+jedis.flushAll());
}
}
二、string操作
package com.study;
import redis.clients.jedis.Jedis;
import java.util.concurrent.TimeUnit;
public class TestString {
public static void main(String[] args) {
Jedis jedis = new Jedis("192.168.137.4", 6379);
jedis.flushDB();
System.out.println("========添加数据=======");
System.out.println(jedis.set("key1","value1"));
System.out.println(jedis.set("key2","value2"));
System.out.println(jedis.set("key3","value3"));
System.out.println("删除键key2："+jedis.del("key2"));
System.out.println("获取键key2："+jedis.get("key2"));
System.out.println("修改key1："+jedis.set("key1","value1Changed"));
System.out.println("获取key1的值："+jedis.get("key1"));
System.out.println("添加多个键值对："+jedis.mset("key01","value01","key02","value02","key03","value03"));
System.out.println("获取多个键值对："+jedis.mget("key01","key02","key03"));
System.out.println("删除多个键值对："+jedis.del("key01","key02"));
jedis.flushDB();
System.out.println("========新增键值对防止覆盖原先值========");
System.out.println(jedis.setnx("key1","value1"));
System.out.println(jedis.setnx("key2","value2"));
System.out.println(jedis.setnx("key2","value2-new"));
System.out.println("获取多个键值对的值"+jedis.mget("key1","key2"));
System.out.println("========新增键值对并设置有效时间==========");
System.out.println(jedis.setex("key3",2,"value3")); //有效时间为2秒
System.out.println(jedis.get("key3"));
try {
TimeUnit.SECONDS.sleep(3);
}catch (InterruptedException e){
e.printStackTrace();
}
System.out.println(jedis.get("key3"));
System.out.println("========获取原值，更新为新值=======");
System.out.println(jedis.getSet("key2","key2GetSet"));
System.out.println(jedis.get("key2"));
System.out.println("获得key2的值的字串："+jedis.getrange("key2",2,4));
}
}
三、set操作
package com.study;
import redis.clients.jedis.Jedis;
public class TestSet {
public static void main(String[] args) {
Jedis jedis = new Jedis("192.168.137.4",6379);
jedis.flushDB();
System.out.println("============向集合中添加元素（不重复）============");
System.out.println(jedis.sadd("eleSet", "e1","e2","e4","e3","e0","e8","e7","e5"));
System.out.println(jedis.sadd("eleSet", "e6"));
System.out.println(jedis.sadd("eleSet", "e6"));
System.out.println("eleSet的所有元素为："+jedis.smembers("eleSet"));
System.out.println("删除一个元素e0："+jedis.srem("eleSet", "e0"));
System.out.println("eleSet的所有元素为："+jedis.smembers("eleSet"));
System.out.println("删除两个元素e7和e6："+jedis.srem("eleSet", "e7","e6"));
System.out.println("eleSet的所有元素为："+jedis.smembers("eleSet"));
System.out.println("随机的移除集合中的一个元素："+jedis.spop("eleSet"));
System.out.println("随机的移除集合中的一个元素："+jedis.spop("eleSet"));
System.out.println("eleSet的所有元素为："+jedis.smembers("eleSet"));
System.out.println("eleSet中包含元素的个数："+jedis.scard("eleSet"));
System.out.println("e3是否在eleSet中："+jedis.sismember("eleSet", "e3"));
System.out.println("e1是否在eleSet中："+jedis.sismember("eleSet", "e1"));
System.out.println("e1是否在eleSet中："+jedis.sismember("eleSet", "e5"));
System.out.println("=================================");
System.out.println(jedis.sadd("eleSet1", "e1","e2","e4","e3","e0","e8","e7","e5"));
System.out.println(jedis.sadd("eleSet2", "e1","e2","e4","e3","e0","e8"));
System.out.println("将eleSet1中删除e1并存入eleSet3 中："+jedis.smove("eleSet1", "eleSet3", "e1"));//移到集合元素
System.out.println("将eleSet1中删除e2并存入eleSet3 中："+jedis.smove("eleSet1", "eleSet3", "e2"));
System.out.println("eleSet1中的元素："+jedis.smembers("eleSet1"));
System.out.println("eleSet3中的元素："+jedis.smembers("eleSet3"));
System.out.println("============集合运算=================");
System.out.println("eleSet1中的元素："+jedis.smembers("eleSet1"));
System.out.println("eleSet2中的元素："+jedis.smembers("eleSet2"));
System.out.println("eleSet1和eleSet2的交 集:"+jedis.sinter("eleSet1","eleSet2"));
System.out.println("eleSet1和eleSet2的并 集:"+jedis.sunion("eleSet1","eleSet2"));
System.out.println("eleSet1和eleSet2的差 集:"+jedis.sdiff("eleSet1","eleSet2"));//eleSet1中有，eleSet2中没有
jedis.sinterstore("eleSet4","eleSet1","eleSet2");//求交集并将交集保存到dstkey的集合
System.out.println("eleSet4中的元素："+jedis.smembers("eleSet4"));
}
}
四、List操作
package com.study;
import redis.clients.jedis.Jedis;
public class TestList {
public static void main(String[] args) {
Jedis jedis = new Jedis("192.168.137.4", 6379);
jedis.flushDB();
System.out.println("===========添加一个list===========");
jedis.lpush("collections", "ArrayList", "Vector", "Stack", "HashMap", "WeakHashMap", "LinkedHashMap");
jedis.lpush("collections", "HashSet");
jedis.lpush("collections", "TreeSet");
jedis.lpush("collections", "TreeMap");
System.out.println("collections的内容："+jedis.lrange("collections", 0, -1));//-1代表倒数第一个元素，-2代表倒数第二个元素,end为-1表示查询全部
System.out.println("collections区间0-3的元 素："+jedis.lrange("collections",0,3));
System.out.println("===============================");
// 删除列表指定的值 ，第二个参数为删除的个数（有重复时），后add进去的值先被删，类似于出栈
System.out.println("删除指定元素个数："+jedis.lrem("collections", 2, "HashMap"));
System.out.println("collections的内容："+jedis.lrange("collections", 0, -1));
System.out.println("删除下表0-3区间之外的元 素："+jedis.ltrim("collections", 0, 3));
System.out.println("collections的内容："+jedis.lrange("collections", 0, -1));
System.out.println("collections列表出栈（左 端）："+jedis.lpop("collections"));
System.out.println("collections的内容："+jedis.lrange("collections", 0, -1));
System.out.println("collections添加元素，从列表右端，与lpush相对 应："+jedis.rpush("collections", "EnumMap"));
System.out.println("collections的内容："+jedis.lrange("collections", 0, -1));
System.out.println("collections列表出栈（右 端）："+jedis.rpop("collections"));
System.out.println("collections的内容："+jedis.lrange("collections", 0, -1));
System.out.println("修改collections指定下标1的内 容："+jedis.lset("collections", 1, "LinkedArrayList"));
System.out.println("collections的内容："+jedis.lrange("collections", 0, -1));
System.out.println("===============================");
System.out.println("collections的长度："+jedis.llen("collections"));
System.out.println("获取collections下标为2的元 素："+jedis.lindex("collections", 2));
System.out.println("===============================");
jedis.lpush("sortedList", "3","6","2","0","7","4");
System.out.println("sortedList排序前："+jedis.lrange("sortedList", 0, -1));
System.out.println(jedis.sort("sortedList"));
System.out.println("sortedList排序后："+jedis.lrange("sortedList", 0, -1));
}
}
五、Hash操作
package com.study;
import redis.clients.jedis.Jedis;
import java.util.HashMap;
import java.util.Map;
public class TestHash {
public static void main(String[] args) {
Jedis jedis = new Jedis("192.168.137.4", 6379);
jedis.flushDB();
Map<String,String> map = new HashMap<>();
map.put("key1","value1");
map.put("key2","value2");
map.put("key3","value3");
map.put("key4","value4");
//添加名称为hash（key）的hash元素
jedis.hmset("hash",map);
//向名称为hash的hash中添加key为key5，value为value5元素
jedis.hset("hash", "key5", "value5");
System.out.println("散列hash的所有键值对 为："+jedis.hgetAll("hash"));//return Map<String,String>
System.out.println("散列hash的所有键为："+jedis.hkeys("hash"));//return Set<String>
System.out.println("散列hash的所有值为："+jedis.hvals("hash"));//return List<String>
System.out.println("将key6保存的值加上一个整数，如果key6不存在则添加 key6："+jedis.hincrBy("hash", "key6", 6));
System.out.println("散列hash的所有键值对为："+jedis.hgetAll("hash"));
System.out.println("将key6保存的值加上一个整数，如果key6不存在则添加 key6："+jedis.hincrBy("hash", "key6", 3));
System.out.println("散列hash的所有键值对为："+jedis.hgetAll("hash"));
System.out.println("删除一个或者多个键值对："+jedis.hdel("hash", "key2"));
System.out.println("散列hash的所有键值对为："+jedis.hgetAll("hash"));
System.out.println("散列hash中键值对的个数："+jedis.hlen("hash"));
System.out.println("判断hash中是否存在 key2："+jedis.hexists("hash","key2"));
System.out.println("判断hash中是否存在 key3："+jedis.hexists("hash","key3"));
System.out.println("获取hash中的值："+jedis.hmget("hash","key3"));
System.out.println("获取hash中的 值："+jedis.hmget("hash","key3","key4"));
}
}
Redis整合springboot
1、新建一个springboot web项目
2、导入相关依赖
<!--redis-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>
<!--springboot集成redis所需的commnos-pool2依赖-->
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-pool2</artifactId>
</dependency>
3、编写controller层
package com.study.redis_springboot.controller;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
@RequestMapping("/redisTest")
public class RedisTestController {
@Autowired
private RedisTemplate redisTemplate;
@GetMapping
public String testRedis(){
//opsForValue 操作字符串
//opsForList 操作list
//opsForSet 操作set
//opsForHash 操作hash
//除了基本的操作，我们常用的方法都可以直接通过redisTemplate操作，比如事务和基本的CRUD
redisTemplate.opsForValue().set("name","lucy");
String name = (String) redisTemplate.opsForValue().get("name");
return name;
}
}
4、启动测试
